Which gas is formed when `Ag_(2)C_(2)` is allowed to react with dilute HCl?

Answer

To determine which gas is formed when silver acetylide (Ag₂C₂) reacts with dilute hydrochloric acid (HCl), we can follow these steps:

### Step 1: Write the chemical equation for the reaction.
The reaction between silver acetylide and dilute HCl can be represented as follows:

\[ \text{Ag}_2\text{C}_2 + 2 \text{HCl} \rightarrow 2 \text{AgCl} + \text{C}_2\text{H}_2 \]

### Step 2: Identify the products of the reaction.
From the balanced equation, we can see that the products formed are:
- Silver chloride (AgCl), which is a salt.
- Ethyne (C₂H₂), which is a gas.

### Step 3: Conclude the gas formed.
The gas that is formed when Ag₂C₂ reacts with dilute HCl is ethyne (C₂H₂), commonly known as acetylene.

### Final Answer:
The gas formed when Ag₂C₂ is allowed to react with dilute HCl is **C₂H₂ (ethyne or acetylene)**.

---